unable to run a UE5.X win64 package

Hello,

In July 2024 we were unable to run a UE5.X win 64 package (generated during this period).
There are no errors or warnings during the packaging process

Error below:

image

we didn’t take a screenshot but its exactly the same as this one ticket :

  • error message
  • inconsistent date (replace 25/02/2016 by 26/07/2024 and 12/01/2016 by 05/06/2024), the .exe date is different between project.

It doesn’t matter:

  • Unreal version (5.3 - 5.4)
  • PC (hardware spec)
  • Project

Info:

  • The machines are connected to an internal network and managed by IT (security, …).
    According to IT, there have been no alerts or updates of any kind on these machines.
  • We packaged locally (this ticket has no connection with our problem).

We tested :

  • Pack the project template third person character → the problem remains
  • Reinstall UE5 and MSVC → the problem remains
  • Prepare a blank PC, install UE5, MSVC, package → OK
  • Add this PC to the internal network → OK

From August 2024 (the company was closed during July) the problem disappeared on all PCs. “No update was performed”.

I’m assuming that these PC have been modified/blocked, but I’d like to know what could have caused this error (antivirus, registry modification, etc.)?